.plan Handler is a utility to facilitate time-sensitive use of .plan and .project files. Its curses-based interface allows users to easily view, edit, replace, and delete content. A timestamp is automatically prepended to the contents of the files.

2do is a simple to-do list manager written in PHP
and using a MySQL database backend. It supports
unlimited numbers of projects, has templated HTML
allowing for complete customisation, and can be
publically viewable by all, or can be protected by passwords. Administration is done via simple Web-based forms.

ACCELA is a library of wrapper classes for the Mac
OS toolbox. It features a complete set of Carbon
Events classes, which can also be used with
PowerPlant. Other classes cover Navigation
Services, Core Foundation, QuickTime, QuickDraw,
AppleEvents, etc.

The ACPI wakeup tool is a small command line
application that allows your Linux computer to
wake up from soft-off (S5) at a predetermined
time. It is ideal for situations where you want to
have a server turn off at night but power itself
on in the morning automatically.

ADODB is a set of advanced PHP database
abstraction classes. It supports MySQL,
PostgreSQL, Interbase/Firebird, Informix, Sybase
SQL Anywhere, Oracle, MS SQL 7 and 2000, SAP DB,
Sybase, DB2, FrontBase, Foxpro, Access, Netezza,
LDAP, ODBTP, ADO, and generic ODBC. A metatype
system is built in, making it possible to figure
out that types such as CHAR, TEXT, and STRING are
equivalent in different databases. It also
features portable database creation,
database-backed session support (with encryption),
SQL performance monitoring, and database health
checks.

AES Encryption for Shell Scripts provides strong encryption/decryption using the Advanced Encryption Standard algorithm "Rijndael" to do 128-bit encryption. It is intended for use in shell scripts or as part of a larger cryptosystem, not as a standalone program.

AGT is a powerful console frontend to iptables,
supporting nearly all of the iptables extensions
(such as quota, random, MIRROR, multiport, owner,
string, MAC address, and more). All options can be
specified in a configuration file with similar
syntax to 'ipf' and 'ipfw'.

The ATLAS (Automatically Tuned Linear Algebra Software) project is an ongoing research effort focusing on applying empirical techniques in order to provide portable performance. It provides C and Fortran77 interfaces to a portably efficient BLAS implementation, as well as a few routines from LAPACK.